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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Ventilation: MVHR Commissioning

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    • CommentAuthorCerisy
    • CommentTimeNov 22nd 2015 edited
     
    Guys - having finally sorted the MVHR system and insulated the roof spaces (I had to finish the ductwork in the roof spaces first of course!) I am starting to set up the system. My Titon unit is reasonably easy to adjust and the company have been excellent with advice, however I appreciate that I really need to make sure that each outlet / extract is achieving the required flow rates and to do that I need an hooded anemometer.

    Has anyone got one to sell or hire out?

    Currently we seem to be just about okay with the temperature in the house, but it is unusually mild so that's a little worrying! We always allowed for a wood burning stove as a back up heat source, but that won't go in until January - things move exceedingly slow in France! - so I need to cover all the angles to keep the OH happy.

    Thanks, regards, Jonathan
    •  
      CommentAuthordjh
    • CommentTimeNov 23rd 2015
     
    Posted By: CerisyI need an hooded anemometer.
    Has anyone got one to sell or hire out?

    In the UK, it has to be a certified meter to meet regs, dunno about France. But if you don't care, people have bought cheap anemometers from e.g. Maplins and made paper cones to suit and the combination has been reported as working well. Sorry don't have any links or remember any keywords.

    Currently we seem to be just about okay with the temperature in the house, but it is unusually mild so that's a little worrying!

    Just buy one or two of the cheap electric heaters that fill the shops at this time of year. They'll be fine until you get your real heating.
    • CommentAuthorwookey
    • CommentTimeJan 13th 2017
     
    I bought one of these and made a paper (cereal-box card actually) cone for it. It's works very well (It was useless without this cone for getting real measurements).

    HYELEC 6252B. About 30 quid on ebay. I was a little worried that it didn't go low enough, but it does.
    • CommentAuthorEd Davies
    • CommentTimeJan 13th 2017
     
    Posted By: djhIn the UK…
    England and Wales. Scotland, AIUI, doesn't require formal commissioning of domestic MVHR so won't have an equivalent requirement. Dunno about NI.

    Please would people get a grip of which country they live in.
    • CommentAuthorGreenfish
    • CommentTimeJan 14th 2017 edited
     
    Hired a certified meter for commissioning (helped the plumber do it), think it was ~£50 per week (in 2014). Then did a DIY version for twiddling/checking, and cone was vital. It seemed relatively accurate compared to the certified measurements, but never did work out how to get absolute values from it.

    See http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12684
    although the images of my craftwork seem to have vanished. I'll see if I can repost them.
    •  
      CommentAuthordjh
    • CommentTimeJan 14th 2017
     
    Posted By: Ed DaviesEngland and Wales. Scotland, AIUI, doesn't require formal commissioning of domestic MVHR so won't have an equivalent requirement.

    Interesting. I hadn't realized quite how different the Scottish system is. It appears to be broken though. They appear to not only exempt domestic installations of ventilation from testing but also from inclusion in the energy consumption calculations! Seems to be even more broken than English SAP in that respect.

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